bb.which: fix broken direction/reverse argument

(Bitbake rev: 4725d83f532cad96168aa9affdedb33b6fc897b7)

Signed-off-by: Chris Larson <chris_larson@mentor.com>
Signed-off-by: Richard Purdie <rpurdie@linux.intel.com>

bitbake/lib/bb/utils.py

@@ -611,7 +611,7 @@ def which(path, item, direction = 0):
     if direction != 0:
         paths.reverse()
 
-    for p in (path or "").split(':'):
+    for p in paths:
         next = os.path.join(p, item)
         if os.path.exists(next):
             return next